The Flight Management System (FMS) onboard civil aircraft is an important system for controlling the flight trajectory in flight operation.The FMS constructs an economical flight profile based on the airborne Performance Database (PDB) and completes the trajectory control task by interacting with the display system,the auto-flight control system and the navigation system.To solve the airworthiness issue of FMS PDB and ensure the PDB correctness and integrity,one method combining the element-level database testing with system-level functional verification is proposed innovatively to demonstrate that the airborne PDB meets the requirements on system function,performance and airworthiness.The element-level testing technology of the airborne PDB on raw data structural integrity,format correctness and data accuracy is studied,and the system-level airborne PDB integrated functional verification technology is studied,which provide support for the autonomous control of civil aircraft FMS PDB key technologies.